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arXiv cs/0206019cs.CG
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平面图及其对偶图在网格上的同时嵌入

Simultaneous Embedding of a Planar Graph and Its Dual on the Grid

C. Erten, S. G. Kobourov

摘要:

传统的图的表示和它们的顶点表示要求对偶顶点被放置在它们对应的原始面内,并且对偶图的边只与它们对应的原始边相交。我们考虑的问题,同时嵌入一个平面图和它的对偶到一个小的整数网格,使边缘被画成直线段和唯一的交叉点之间的原始对偶对的边缘。我们提供了一个线性时间算法,同时嵌入一个3-连通平面图和它的对偶在一个(2n-2)(2n-2)整数网格,其中n是在图和它的对偶的顶点总数。此外,我们的嵌入算法满足上述两个自然要求。

英文摘要:

Traditional representations of graphs and their duals suggest the requirement that the dual vertices be placed inside their corresponding primal faces, and the edges of the dual graph cross only their corresponding primal edges. We consider the problem of simultaneously embedding a planar graph and its dual into a small integer grid such that the edges are drawn as straight-line segments and the only crossings are between primal-dual pairs of edges. We provide a linear-time algorithm that simultaneously embeds a 3-connected planar graph and its dual on a (2n-2) by (2n-2) integer grid, where n is the total number of vertices in the graph and its dual. Furthermore our embedding algorithm satisfies the two natural requirements mentioned above.

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